Pressure fuel oil feed system for oil engines



April 19, 1932. w. l.. RoBiNsoN PRESSURE FUEL OIL FEED SYSTEM FOR OILENGINES Filed May 5, 1930 2 Sheets-Shea*l l Inventor DO Z 7'7150 2z @afnA orney April 19, 1932. w. ROBINSON PRESSURE FUEL OIL FEED SYSTEM FOROIL ENGINES Filed May 5, 1930` 2 Sheets-Sheet 2 Wfl. pZ/nson A orneyPatented Apr. 19, 1932,

UNITED STATES PATENT oFFlcE WILLIE T.. noBINsoN, or marin, oxmnoim.rnrssuim ruin. on. 'rm svsrmm non oir. Encinas Application led Iay 8,

This invention relates to new and useful improvements in feedin fuel oiltothe fuel injector Apump of heavy uty oil pumps.

A primary object of the invention 1s to provide'an improved fuel oilfeeding system of the above mentioned character especially adapted forpreventing the accumulation of air in the fuel oil injector governor pumof a well known-type of heavy duty oil engines.

Other objects and advanta es of the invention will become apparent uringa study of the following descriptionhtaken in connection with theaccompanying drawings, whlerein; t. y f

i re 1 is a rspec ive view o m improvegdl feed `systiiiam, the samebeing shown as applied to a heavy duty oil engine,

Figure 2 is an elevational view of my improved system, the same ybeingshown some- A what diagrammatically.

Figure 3 is a fragmentary detail of a feed pump embodied in my improvedsystem,

Figure 4 is a fragmentary detail sectional view taken substantially onthe line 4-4 of 25 Figure 3, c

Figure 5 is a longitudinal sectional view taken through a trap embodyinga part of the improved system.

Referring more in detail to -the drawings it will be seen that incariying out my improved system, instead o connecting the regular feedpipe from the bottom^of the fuel oil reservoir chamber 5 directl to thefuel oil injection governor pump I provide a suction line or fuelconduit 6 which leads from the bottom of the reservoir 5 to a pumpdesignated generally by the refer ence character P.

The pump P is of a well kiiown type of ro-A tary geared pump. Arrangedin the conduit 6 is a manually operable control valveV 7.l

1930. Serial No. 449,864.

duit which leads to the suction pipe arrangement 16 of the pump P.

The trap 11 comprises a tubular casing 12 closed at its upper and lowerends through the medium of suitable caps, the upper cap of which isAprovided with an inlet ni plev into whichv is threaded the lower end othe pipe 10, said upper cap being also provided with an outlet nipple 14into which is thread- Ved one end of the ipe 15. (See Figure 5). 60

A force feed con uit leads from the top of the pump P to the top of thefuel reservoir chamber 5. The said conduit includes a pi e 19 suitablycoupled to and leading from t `e top of the pump P. A pipe 2O branchesfrom .the pipe 19 and at its end terminates in a :Ihe above referred toforce feed conduit includes a branch of which pipe20 and' trap are a artof said branch. Completing this branch is a pipe 27 suitably coupled asat 26 80 with the' to of the filtering trap 25. At its other endt e pipe27 has elbow connection with a` vertically disposed pi e 30. The pipe 30at its lower end has suitab e elbow connec`. tion with an intake pipe 31leadin laterall j from the pump F. Arranged4 in t e pipe is a checkvalve 29. -5

On the opposite side of the pum F is av three way valve T formin a partof t e usual n feed system of the oil engine, and in this con-4 nectionth'en it will be noted that in the present system coinprehended by thisinvention feed to the pump F is on the opposite side of the [ump fromthe point of injection inthe re ar equipment that is to say, that the inet and outlet ofthe injection pump are diametrically opposite to oneanother, in-

stead of being at right angles toone another as'was formerly the case.

From the foregoing then it will be seen 1 i that as comprehended by thepresent system during operation of the pump P oil is drawn by suctiondirectly from the fuel oil reservoir chamber to said pump P and fromsaid .pump forced upwardly through the force feed conduit to the top ofsaid reservoir, the oil passing through and being filtered in the trap11 through the medium of the filtering screen 13 arranged in the trap.During the drawing of the fuel from the reservoir, the three way valve Tis closed while the needle valve 23 may be partly closed whereby isprovided a back pressure thrown against the fuel oil injection governorpump F. During this operation of the system air is exhausted through thevent 24 thereby elimi nating the accumulation of air in the fuel oilinjection ump as was the diiiicult-y experienced in ormer systems whichaccumulation of air created a back pressure that broke the fuel oil andcaused the engine to miss firing.

Furthermore, in my s stem, it vwill be noted that before the fuel 011can enter the fuel oil injection governor pum F it is passed by the backpressure first re erred to through the trap 25 of the branch of theforce feed conduit where the oil is again filtered and from saidiilterinff trap 25 the oil passes throu h the check valve 29 to finallypass into t e ejection pump F. The passage of the oil through the checkvalve 29 will further maintain pressure against the fuel oil while theengine is at rest, thus eliminating any possibility of air accumulatingwhile the engine is at rest.

Preferably to accomplish this purpose the release valve V of the pump Pis set at a working pressure of eight pounds and the needle valve 29isset at a working pressure of iive ounds, thus eliminating anypossibility of) any over accumulation of pressure at the firing nozzle;this pressure being registered by a suitable gauge G associated with thepipe 27 but no pressure can be accumulated above eight pounds, theworking point of the release valve o`n thefrotary pump.

It will be further noted, that the pump P comprises among other parts apulley 33 over which is trained a belt 34, which belt 34 is in turntrained over a pulley 35 carried at the end of the governor shaft, sothat it will be seen thatthe rotarygear ump P is driven from theinjection pum for creatin the necessary pressure to orce the fuel oi?through the system.

Should in any event, the system require riming any time before starting,this can e accomplished b removing the plug 19 normally closing t eupper end of the pipe 19 As asbstitute for the" plug, and as sugested inFigure 1, a suitable gauge I `may e uti-lized therefor. The pump P issuitably supported on the engine E through the mediun of a bracket B, ofsomewhat angular construction suitably bolted on top of the inspectionplate at the top of the governor housing, as is apparent.

To the bracket B is suitably attached a hanger D to which in turn issuitably secured the vpump P. It may be well to mention here that in theoriginal equipment, fuel oil was taken from the bottom of the fuel oilreservoir chamber direct to the three way valve T at the left of thefuel oil injection pump F. The oil was supplied in this manner to thegovernor pump by gravity flow and by this system, the air passes throughthe fuel oil and is accumulated in the governor pump, forming airpockets that broke the iiow of trream of fuel oil, causing the engine tomiss To elminate this, it was necesary to frequentlystop the engine,disconnect the fuel line from the nozzle, and pump out the'accumulatedair, which manifestly caused quite a loss of time and no small amountvof inconvenience not to mention the financial loss caused by suchdelay.

Through the medium of my invention such accumulation of air in theinjector pump is safeguarded against, and has been further found toovercome the aforementioned defects of the former system used in theregular equi ment, my invention fully illustrating its capa ility andadvantages while operating under-actual working conditions. Even thoughI have herein shown and described the preferred embodiment of myinvention, it is to be understood that the same is susceptible tochanges fully comprehended by the spirit of the invention as hereindescribed, and the scope of the appended claims. t

Havingthus described my invention, what I claim as new is:

1. Means for supplying liquid free of foreign matter and air to a memberin combination with a reservoir containing the liquid, a pump, a conduitconnecting the inlet of the pump to the reservoir, a filter chamber, aconduit connecting the outlet of the pump to said chamber, a conduitconnecting the last-mentioned conduit with the top of the reservoir, acontrol valve in the third conduit, a vent pipe connected with the thirdconduit for venting air therefrom, a fourth conduit connecting thedischarge of the filter chamber to said member and a' control valve insaid fourth conduit.

2. Means for supplying liquid free of foreign matter and air to a memberin combination with a reservoir containing the liquid, a pump, a conduitconnecting the inlet of the pump to the reservoir, a iilterchamber, aconduit connecting the outlet of the pump to said chamber, a conduitconnecting the last-mentioned conduit, a vent pipe connected with thethird conduit for venting air therefrom, a fourth conduit connecting thedischarge of the filter chamber to said member and a control valve insaid fourth conduit, and said pump having a, by-pass passage therein anda spring controlled valve in the by-passd Inv testimony whereof I aix mysigna,-

ture.

WILLIE L. ROBINSON.

